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So far, 11 cases have been identified in Ohio this year. None of the cases have been fatal, though at least one person has died in Indiana.

The Centers for Disease Control and Prevention said Wednesday that 2012's outbreak is the largest ever nationwide.

West Nile virus (WNV) is a viral disease affecting the central nervous system that can be transmitted to humans by mosquitoes. Most people who are bitten by an infected mosquito will never become sick.